JPanel not registering resize

Question

Hello, I have several JPanels laid out with BorderLayout. The CENTER panel contains two JPanels with some custom painting in them. These two panels are laid out with GridLayout. When the user clicks on a button a label gets added to the SOUTH panel of the GridLayout causing it to grow larger and the CENTER panel to shrink. When this happens a call is made to resize the custom drawing in the two panels in the CENTER panel. When I call getWidth() and getHeight() it returns the old size of the panels instead of the new smaller size. When I click on the corner of the window like I would if I wanted to resize the whole thing getWidth() and getHeight() return the correct sizes and the custom painting is drawn correctly. Here is the code in question:
from the JFrame (extends ComponentListener)
public void componentResized(ComponentEvent e)
  reSizeGraphs();
public void componentHidden(ComponentEvent e)
public void componentMoved(ComponentEvent e)
public void componentShown(ComponentEvent e)
public void reSizeGraphs() // gets called when the CENTER JPanel is resized
  pop1_graph.reSize();
  pop2_graph.reSize();
}pop1_graph and pop2_graph are the two JPanels in the CENTER JPanel of the BorderLayout.
Here is the code in the pop_graphs:
public void reSize()
  width  = getWidth();
  height = getHeight();
  repaint();

Answer 1

make sure your
public void reSize() {
width = getWidth();
height = getHeight();
repaint();
ask the real panel size, not the JFrame size.
it seems your getWidth and getHeight always get the JFrame size.
try more specific like panel1.getWidth() and panel1.getHeight()
I quickly dvlp a test program, every thing works correctly,
that may not swing problem, there are some bug in your code.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame {
  JButton b = new JButton("Click to add label");
  JPanel p1 = new JPanel();
  JPanel p2 = new JPanel();
  JPanel center = new JPanel(new GridLayout(1,2));
  JLabel label = new JLabel("Add to change the size");
  boolean added = false;
  public Test() {
    center.add(p1);
    center.add(p2);
    getContentPane().add(b, BorderLayout.WEST);
    getContentPane().add(center, BorderLayout.CENTER);
    p1.add(new JButton("anything"));
    p2.add(new JButton("anything"));
    p1.setBorder(BorderFactory.createLineBorder(Color.red, 2));
    p2.setBorder(BorderFactory.createLineBorder(Color.green, 2));
    //pack();
    setSize(400, 200);
    System.out.println("p1: width=" + getWidth()+ ", height=" + getHeight());  
    System.out.println("p2: width=" + getWidth()+ ", height=" + getHeight());
    p1.addComponentListener(new ComponentAdapter() {
      public void componentResized(ComponentEvent e) {
        System.out.println("p1: width=" + p1.getWidth()+
                           ", height=" + p1.getHeight());
    p2.addComponentListener(new ComponentAdapter() {
      public void componentResized(ComponentEvent e) {
        System.out.println("p2: width=" + p2.getWidth()+
                           ", height=" + p2.getHeight());
    b.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        if (added) { getContentPane().remove(label); }
        else { getContentPane().add(label, BorderLayout.SOUTH); }
        added = !added;
        validate();
  public static void main(String[] args) {
    JFrame f = new Test();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
}